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Asset Quality and Allowances for Loan and Lease Losses and Unfunded Loan Commitments and Letters Of Credit (Home Equity and Residential Real Estate Balances) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Financing Receivable, Recorded Investment [Line Items]      
Purchased Impaired Loans - Outstanding Balance $ 7,521 $ 9,723  
Total Loans 159,014 [1],[2],[3],[4] 150,595 [1],[2],[3],[4] 157,543
Total Consumer Real Estate Secured Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Loans Outstanding - Excluding Purchased Impaired Loans 41,014 [5] 42,298 [5]  
Purchased Impaired Loans - Outstanding Balance 6,533 [5] 7,924 [5]  
Government Insured or Guaranteed Loans 2,884 [5] 2,488 [5]  
Purchase accounting, deferred fees and other accounting adjustments (2,873) (2,485)  
Total Loans $ 47,558 [6] $ 50,225 [6]  
[1] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).
[2] Amounts represent items for which the Corporation has elected the fair value option.
[3] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $2.3 billion and $2.7 billion at December 31, 2011 and December 31, 2010, respectively.
[4] Future accretable yield related to purchased impaired loans is not included in loans outstanding.
[5] Represents outstanding balance.
[6] Represents recorded investment.